Amazon.com: 40mm Speaker Driver, 2 Pack Headphone Speaker Units 32ohm Replacement for Bose QC35 QC25 QC15 QC2 QC3 AE2 OE2, Beats Solo Studio, Razer
I partially disassembled the KZ ZS10 Pro and here are some neat things I found : r/headphones,Accessories – Ultimate Ears PRO,Amazon.com: 40mm Speaker Driver, 2 Pack Headphone Speaker Units 32ohm Replacement for Bose QC35 QC25 QC15 QC2 QC3 AE2 OE2, Beats Solo Studio, Razer ,Amazon.com: Headphone Upgrade Cable for IE40 Pro 3.9 Feet Lossless OFC Core Replacement Cable : Electronics